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PHENIX first measurement of J/Psi elliptic flow parameter v2 in Au-Au collisions at sqrt(s) = 200 GeV

Silvestre, C.; Christiansen, Peter LU ; Gustafsson, Hans-Åke LU ; Haslum, Eva LU ; Oskarsson, Anders LU ; Rosendahl, Sarah LU and Stenlund, Evert LU (2008) In Journal of Physics G: Nuclear and Particle Physics 35.
Abstract
Recent results indicate that the J/ψ suppression pattern differs with rapidity showing a larger suppression at forward rapidity. J/ψ suppression mechanisms based on energy density (such as color screening, interaction with co-movers, etc) predict the opposite trend. However, it is expected that more pairs should be available to form quarkonia at mid-rapidity via recombination. Some models provide a way to differentiate J/ψ production from initially produced pairs and final state recombination of uncorrelated pairs, via the rapidity and transverse momentum dependence of the elliptic flow (v2). During 2007 data taking at RHIC, a large sample of Au+Au collisions at 200 GeV was collected. The statistics has been increased compared to the... (More)
Recent results indicate that the J/ψ suppression pattern differs with rapidity showing a larger suppression at forward rapidity. J/ψ suppression mechanisms based on energy density (such as color screening, interaction with co-movers, etc) predict the opposite trend. However, it is expected that more pairs should be available to form quarkonia at mid-rapidity via recombination. Some models provide a way to differentiate J/ψ production from initially produced pairs and final state recombination of uncorrelated pairs, via the rapidity and transverse momentum dependence of the elliptic flow (v2). During 2007 data taking at RHIC, a large sample of Au+Au collisions at 200 GeV was collected. The statistics has been increased compared to the previous 2004 data set, thus allowing a more precise measurement of the J/ψ production at both mid and forward rapidity. Furthermore, the PHENIX experiment benefited from the addition of a new detector, which improves the reaction plane resolution and allows us to measure the J/ψv2. Comparing this measurement to the positive D-mesons v2 (through non-photonic electron decays) will help in constraining the J/ψ production mechanisms and getting a more precise picture of the proportion of J/ψ coming from direct production or charm quark coalescence. Details on how the J/ψv2 is measured at mid-rapidity are presented. The J/ψv2 as a function of transverse momentum are compared with the existing models. (Less)
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author
organization
publishing date
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Contribution to journal
publication status
published
subject
in
Journal of Physics G: Nuclear and Particle Physics
volume
35
publisher
IOP Publishing
external identifiers
  • scopus:54749112629
ISSN
0954-3899
DOI
10.1088/0954-3899/35/10/104136
language
English
LU publication?
yes
id
ea658d99-4a2b-429b-ae0c-bc38a99ff5ff (old id 1432202)
date added to LUP
2009-08-05 12:33:49
date last changed
2017-01-01 06:02:26
@article{ea658d99-4a2b-429b-ae0c-bc38a99ff5ff,
  abstract     = {Recent results indicate that the J/ψ suppression pattern differs with rapidity showing a larger suppression at forward rapidity. J/ψ suppression mechanisms based on energy density (such as color screening, interaction with co-movers, etc) predict the opposite trend. However, it is expected that more pairs should be available to form quarkonia at mid-rapidity via recombination. Some models provide a way to differentiate J/ψ production from initially produced pairs and final state recombination of uncorrelated pairs, via the rapidity and transverse momentum dependence of the elliptic flow (v2). During 2007 data taking at RHIC, a large sample of Au+Au collisions at 200 GeV was collected. The statistics has been increased compared to the previous 2004 data set, thus allowing a more precise measurement of the J/ψ production at both mid and forward rapidity. Furthermore, the PHENIX experiment benefited from the addition of a new detector, which improves the reaction plane resolution and allows us to measure the J/ψv2. Comparing this measurement to the positive D-mesons v2 (through non-photonic electron decays) will help in constraining the J/ψ production mechanisms and getting a more precise picture of the proportion of J/ψ coming from direct production or charm quark coalescence. Details on how the J/ψv2 is measured at mid-rapidity are presented. The J/ψv2 as a function of transverse momentum are compared with the existing models.},
  articleno    = {104136},
  author       = {Silvestre, C. and Christiansen, Peter and Gustafsson, Hans-Åke and Haslum, Eva and Oskarsson, Anders and Rosendahl, Sarah and Stenlund, Evert},
  issn         = {0954-3899},
  language     = {eng},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics G: Nuclear and Particle Physics},
  title        = {PHENIX first measurement of J/Psi elliptic flow parameter v2 in Au-Au collisions at sqrt(s) = 200 GeV},
  url          = {http://dx.doi.org/10.1088/0954-3899/35/10/104136},
  volume       = {35},
  year         = {2008},
}